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Fair Value Measurement (Details 4) (USD $)
In Millions, unless otherwise specified
12 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Sep. 30, 2013
Student loan auction rate securities
Dec. 31, 2012
Student loan auction rate securities
Dec. 31, 2011
Student loan auction rate securities
Settlement assets          
Basis point change in liquidity risk premium (as a percent)       0.50%  
Change in value of securities due to change in liquidity risk premium and other factors       $ 1  
Reconciliation of significant unobservable inputs (Level 3) used for fair value measurement          
Balance at the beginning of the period     38.8 170.5 341.1
Total gains or losses (realized or unrealized) included in other comprehensive income     (0.4)   1.2
Total realized gains included in product sales and other     1.3 4.4 (4.5)
Sales     (26.1) (135.6) (158.4)
Settlements       (0.5) (8.9)
Balance at the end of the period     13.6 38.8 170.5
Impairments included in product sales and other          
Impairments included in product sales and other $ 5.2 $ 28.2     $ 5.2